Rattle off Ecclesiastes 1 and 2 during ceremony (6)
I believe the answer is:
recite
'rattle off' is the definition.
(I've seen this in another clue)
'2 during ceremony' is the wordplay.
'c' becomes 'ec' (I can't justify this - if you can you should give a lot more credence to this answer).
'during' indicates putting letters inside.
'ceremony' becomes 'rite' (rite is a kind of ceremony).
'ec' going within 'rite' is 'RECITE'.
'ecclesiastes 1 and' is the link.
This may not be correct. Some or all of it may be part of another bit of the clue.
Can you help me to learn more?
(Other definitions for recite that I've seen before include "Intone" , "Repeat, recount" , "Repeat aloud from memory as for audience" , "Speak (eg, a poem)" , "Render verbally" .)